revert memory deletions, should be done properly

src/BulletMultiThreaded/PosixThreadSupport.cpp

@@ -249,8 +249,6 @@ void PosixThreadSupport::stopSPU()
             printf("semaphore destroyed\n");
 		checkPThreadFunction(pthread_join(spuStatus.thread,0));
 
-		if(spuStatus.m_lsMemory)
-			delete spuStatus.m_lsMemory;
         }
 	printf("destroy main semaphore\n");
         destroySem(mainSemaphore);

src/BulletMultiThreaded/Win32ThreadSupport.cpp

@@ -300,8 +300,6 @@ void Win32ThreadSupport::stopSPU()
 		CloseHandle(spuStatus.m_eventStartHandle);
 		CloseHandle(spuStatus.m_threadHandle);
 
-		if(spuStatus.m_lsMemory)
-			delete spuStatus.m_lsMemory;
 	}
 
 	m_activeSpuStatus.clear();

src/BulletMultiThreaded/btParallelConstraintSolver.cpp

@@ -1157,8 +1157,6 @@ btParallelConstraintSolver::~btParallelConstraintSolver()
 {
 	delete m_memoryCache;
 	delete m_solverIO;
-	delete m_barrier;
-	delete m_criticalSection;
 }